ProductSearch.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogInventory\Model\Plugin;

use Magento\CatalogInventory\Helper\Stock;

class ProductSearch
{
    private $stockHelper;

    public function __construct(Stock $stockHelper)
    {
        $this->stockHelper = $stockHelper;
    }

    public function afterPrepareCollection(
        \Magento\Catalog\Model\ProductLink\Search $subject,
        \Magento\Catalog\Model\ResourceModel\Product\Collection $collection
    ): \Magento\Catalog\Model\ResourceModel\Product\Collection {
        $this->stockHelper->addIsInStockFilterToCollection($collection);
        return $collection;
    }
}